Post format displays all formats, even if it's limited in theme support

[divpusher]

Issue Overview

The post format select option lists all post formats, even if it's limited in theme support.

Steps to Reproduce (for bugs)

1. Add a few post format support via add_theme_support() function in your theme's function.php file.

function my_theme_setup(){

    add_theme_support( 'post-formats', array( 'link', 'image', 'gallery' ) );
    
}
add_action( 'after_setup_theme', 'my_theme_setup' );

2. Check classic editor, it displays only those few formats properly.
3. Check Gutenberg, it displays all possible formats.

I'm using Chrome Version 65.0.3325.181 (Official Build) (64-bit) on Win 10.
Gutenberg version: 2.7.0

Expected Behavior

Gutenberg should list only those post formats which are defined in theme support.

Current Behavior

Gutenberg lists all post formats.

Screenshots / Video

[pento]

Thank you for the bug report, @divpshr!

The REST API doesn't expose the post formats the the current post type supports, but we can add this in and filter the list appropriately.

[danielbachhuber]

🔨